2544134663561 has 4 divisors (see below), whose sum is σ = 2547495476292. Its totient is φ = 2540773850832.

The previous prime is 2544134663557. The next prime is 2544134663573. The reversal of 2544134663561 is 1653664314452.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2235727705225 + 308406958336 = 1495235^2 + 555344^2 .

It is a cyclic number.

It is not a de Polignac number, because 2544134663561 - 2² = 2544134663557 is a prime.

It is a super-2 number, since 2×2544134663561² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2544134663461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1680405230 + ... + 1680406743.

It is an arithmetic number, because the mean of its divisors is an integer number (636873869073).

Almost surely, 2^{2544134663561} is an apocalyptic number.

It is an amenable number.

2544134663561 is a deficient number, since it is larger than the sum of its proper divisors (3360812731).

2544134663561 is an equidigital number, since it uses as much as digits as its factorization.

2544134663561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360812730.

The product of its digits is 6220800, while the sum is 50.

The spelling of 2544134663561 in words is "two trillion, five hundred forty-four billion, one hundred thirty-four million, six hundred sixty-three thousand, five hundred sixty-one".